SSD partition alignment confusion

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Re: SSD partition alignment confusion

Postby DrTeeth » Wed Jan 25, 2012 2:05 am

Bob, KB=KiB AIUI.

DrT
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Re: SSD partition alignment confusion

Postby Bob Coleman » Wed Jan 25, 2012 4:06 pm

DrTeeth wrote:Bob, KB=KiB AIUI.

DrT


See Data Storage Size Unit Conventions on page 5 of Image for Dos manual.
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Re: SSD partition alignment confusion

Postby George » Wed Jan 25, 2012 8:38 pm

Thanks for the reference, Bob. I knew I saw the definitions somewhere.
Just couldn't put my finger on it.
George
---
There are 10 kinds of people in the world.
Those who understand binary and
Those who don't.

On 1/25/2012 4:06 PM, Bob Coleman wrote:
> [quote="DrTeeth":h6t1f497]Bob, KB=KiB AIUI.
>
> DrT[/quote:h6t1f497]
>
> See [b:h6t1f497]Data Storage Size Unit Conventions[/b:h6t1f497] on page 5 of Image for Dos manual.
>
>
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Re: SSD partition alignment confusion

Postby Brian K » Wed Jan 25, 2012 8:45 pm

Bob Coleman wrote:See Data Storage Size Unit Conventions on page 5 of Image for Dos manual.


Unfortunately they don't explain the Align at 2KiB issue. TeraByte Support says 2KiB = 2048 but I'll bet most people look at it and think 2 kibibytes.
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Re: SSD partition alignment confusion

Postby a1pcfixer » Thu Jan 26, 2012 4:05 am

Bob,

> See [b:h6t1f497]Data Storage Size Unit Conventions[/b:h6t1f497] on page 5 of Image for Dos manual.

"Because of the confusion that can result when these different data storage size unit conventions
are each referred to as “gigabytes”, the gibibyte (along with the kibibyte, mebibyte, etc.) was
established in 1998 by the International Electrotechnical Commission (IEC)."

Trouble is, the original conventions are soooo deeply embeded, adding the new definitions simply
adds confusion, not lessens it. Like calling the Sears Tower (original name) in Chicago, IL the
Willis Towers (new name). It'll always be the Sears Tower to many people, and many won't easily
accept the newer KiB instead of KB. KiB will get relegated to primarily programmers, and the average
PC user will stay with KB. Just human nature.
--

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http://www.virtual-access.org
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Re: SSD partition alignment confusion

Postby a1pcfixer » Sat Feb 04, 2012 4:43 pm

Brian,

> I obviously don't understand the convention. But to many people it looks like 2 kibibytes.

Your not alone!

Think of it as Kibble & Bits.
--

Jim L.
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Re: SSD partition alignment confusion

Postby fileant » Mon Feb 13, 2012 10:23 pm

I think what Brian is getting at is it should be..
1MiB
or
LBA 2048
Which are both separate things as well.

If you want to say you are using its as 2"KiB LBA" then this means (pedantically) 2*1024*8 which is LBA 16384 confusing for newbies and vets. If your code does 2048 LBA regardless of sector size you should label it LBA 2048. If it does 1MiB regarding of sector size, label it 1MiB. I understand Byte can be any number and you are using 1, but that is more pedantic as the de facto standard is 8. (unless I am wrong somewhere... I got very confused reading it all, lol.)

EDIT: I get you now... you are saying byte=sector.... still confusing as no one thinks of byte as 512 or 4096

What is the correct way to ensure a second JFS partition is aligned on a WD drive? Tick what boxes and slide? The DVR needs to create the partitions.
I have 2 partitions one is 128MB second almost fills and there is 2MB free on the end. First is on LBA 63. I want to make the second partition aligned, don't care about the first.
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KB vs KiB

Postby Milmoor » Sun Mar 11, 2012 4:08 am

1000 and 1024 are really close percentage wise, so intermixing those wasn't an issue in the good old days with 640 KB memory. But when dealing with Terabyte drives, 1024*1024*1024 is a lot more than 1000*1000*1000 (7.3%). So this started to confuse people. Since kilo means 1000 in all other measuring units, the kibi was introduced: http://en.wikipedia.org/wiki/Kilobyte. It takes some getting used to, but it works quite well.
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Re: KB vs KiB

Postby TeraByte Support » Sun Mar 11, 2012 9:14 am

That's why we've been using KiB for years.

"Milmoor" wrote in message news:1675@public.bootitbm...

1000 and 1024 are really close percentage wise, so intermixing those wasn't
an issue in the good old days with 640 KB memory. But when dealing with
Terabyte drives, 1024*1024*1024 is a lot more than 1000*1000*1000 (7.3%). So
this started to confuse people. Since kilo means 1000 in all other measuring
units, the kibi was introduced:

[
http://en.wikipedia.org/wiki/Kilobyte
](http://en.wikipedia.org/wiki/Kilobyte)

.. It takes some getting used to, but it works quite well.

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Re: KB vs KiB

Postby DrTeeth » Sun Mar 11, 2012 10:30 am

On Sun, 11 Mar 2012 09:14:47 PDT, just as I was about to take a herb,
"TeraByte Support" disturbed my
reverie and wrote:

>That's why we've been using KiB for years.

The trouble is that I imagine most people, as I did, assume that it
is the same as KB and that some international body has been messing
with standards. It is useful to know that there IS actually a
difference in value.

Happens all the time and is rife in part of my field - many name
changes and spelling changes. I still call it 'lignocaine' and not the
modern (USA) name of 'lidocaine' .
--

Cheers

DrT
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